Aluminum mold for prepreg


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quinn
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I'm about to start machining my mold but I have a few concerns. The composite part is an 800m long tapered tube. 46mm diameter at one end, 30mm at other end. The closed mold is 75mm square by 800mm long. This means the mold walls will be as thin as 15mm at one end and as thick as 22mm at other end. One concern is the time it takes for this big chunk of aluminum to heat up, the other concern is uneven heating, thinner walled end heating up first. How should I approach this with my ramp cycles? Just go slower in general? Hold temps longer? I'm really not sure what to expect for how long it's gonna take for it to heat up. If the varying wall thickness is gonna be a big problem, I can do some machining on the outside to even it out, but would rather not if it isn't needed. First few parts will be done with vacuum bag so the laminate will be exposed to the heated air but later on I'll be trying silicone expanding plug so I'm sure that will change things as far as heating. Any advice on how to approach this? Thanks
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quinn
q
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Posts: 155, Visits: 992
First mold section. One concern I have is those radiuses in the corners at the close end, they are 4mm. First layer going down will be 200gsm +/-45 twill so I imagine that should bend a bit easier than 0/90. After that is uni running lengthwise. Am I gonna have issues getting the prepreg to stick down in those radiuses? First time using prepreg so not sure how well it wants to stick to polished aluminum with frekote. Is it gonna stay put?
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Edited 6 Years Ago by quinn
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